Johnston & Degan; Grubstake & Lost Boys Prospect, Homer Mining District, Kenai Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Johnston & Degan; Grubstake & Lost Boys Prospect | Prospect |
| Homer Mining District | Mining District |
| Kenai Peninsula Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
59° 31' 11'' North , 150° 29' 23'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fox River | 685 (2011) | 45.9km |
This prospect is within the Kenai Fjords National Park; the area is closed to mineral entry.
Location: The prospect is located on both sides of the ridge that separates Quartz Bay from Surprise Bay, both of which are in the West Arm of Nuka Bay. This is Cobb's (1972, MF-397) location 25 and MacKevett and Holloway's (1977) location 16. Cobb (1979, OFR 80-87) summarized the relevant references to this prospect under the name Johnson and Degan. This location is accurate within half a mile.
Geology: Cretaceous Valdez Group graywacke host the mineralization of the Johnson and Degan prospect (Richter, 1970). Generally quartz veins are hosted in the graywacke although conglomerates are found in the area. The veins are white quartz containing few percent sulfides, although some exposures show considerable iron-staining. A single sample through a vein at an elevation of 1,000 feet, on the Surprise Bay side of the ridge, assayed 0.98 ounces of gold and 1.0 ounce of silver per ton (Pilgrim, 1933).
Workings: Surface trails were laid and trenches were dug in the 1930's. A single sample through a vein at 1000 feet elevation on the Surprise Bay side of the ridge, assayed 0.98 ounces of gold and 1.0 ounce of silver per ton (Pilgrim, 1933).
Age: Tertiary; Boden and others (1991) report other veins in the district are about 55 m.y. old.
Alteration: Extensive oxidation staining on surface outcrops. Borden and others (1991) report other veins in the Nuka Bay district show carbonization, sulfidization, sericitization, and silicification of the wall rock adjacent to the veins.
Reserves: None.
Commodities (Major) - Ag, Au; (Minor) - Pb
Development Status: None
Deposit Model: Low-sulfide, Au-quartz vein (Cox and Singer, 1986; model 36a)
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
5 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Galena Formula: PbS |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrite | FeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | SV010 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chugach DomainAccretionary Complex
Pacific OceanOcean
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